第14卷第6期 2010年6月
Article ID:10077294(2010)06060613
船舶力学
Joumal of Ship Mechanics
VesselMotionEffects onNonlinearDynamicsof
DeepwaterDrillingRiser
WANGTeng,ZHANGXiu-zhan,ZHUWeiquan
Vol.14 No.6 Jun.2010
(Department of Offshore Engineering, China University of Petroleum, Dongying 257061, China)
Abstract: A time domain computer model for deepwater drilling riser subjected to waves, ocean currents and vessel motion was developed in this paper. The vessel motions effects on the dynam-ic response of deepwater riser are investigated, including mean offsets, wave frequency motions, low frequency motions, period and amplitude of the motion. The results show that vessel motion has an important effect on the dynamic response of deepwater riser,and lead to an increase of upper maximum bending moment by 59% compared to the case without vessel motion,under ran-dom waves and current. The mean vessel offset has main effect on lower maximum bending mo-ment.Wave frequency motion has notable effect on the upper maximum bending moment of the drilling riser,and changed sharply with amplitude or period of the wave frequency motion de-creasing.Low frequency motion mainly affects the upper maximum bending moment of the drilling riser
Key words: drilling riser; deepwater; vessel motion; nonlinear dynamics response
CLC number: U674.38*1 1Introduction
Document code:A
The drilling riser is the key element for drilling in deep water.It is a conductor pipe used in floating drilling operations to convey drilling fluid and to guide tools between the drilling vessel and the wellhead at the sea floor.As exploratory drilling operations move into deeper water,the dynamic effects in riser design become of increasing concern. The dynamic response of riser depends on numerous different factors related to its architecture,operational and envi-ronmental conditions. These include water depth, mud weight, sea states current profiles and vessel motion. As the increase of water depth, vessel motions are more significant for dynamic response of deepwater riser, and produce significant dynamic stress in the drilling riser.
In the dynamic analysis,the effect of vessel motions should be combined with wave and current forces to obtain the response of the riser.Vessel offset and motions constitute a source of both static and dynamic loading on the riseril, The horizontal motions of the drilling vessel in waves are a major factor in determining the dynamics response of marine riser and a sig
Received date：2009-0216
Foundation item: Supported by a grant from the National HiTech "863 Plan Fund(2006AA09A106) Biography : WANG Teng(1973), male, Ph. D., profesor of China University of Petroleum, Email
wteng1973@126.com.
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